If a boat in the zone of a mark
to be left to port passes head to wind from port to starboard tack and is then
fetching the mark, she shall not
cause a boat that has been on starboard tack since entering the zone to sail
above close-hauled to avoid contact and she shall give mark-room
if that boat becomes overlapped
inside her. When this rule applies between boats, rule
18.2 does not apply between them.